Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27b1ff259deb53c…

MALICIOUS

PDF

83.7 KB Created: 2021-09-22 21:28:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a137856bb685cc543e4b341d3d95a851 SHA-1: e6b948fa6ecf3d6f5b2ab81ae4494018fddda82d SHA-256: b27b1ff259deb53c6ecfe58a8725489af49718ffdc692a57111e9a18c8e3d0fd
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm or distribution point for malicious content. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common social engineering tactic to conceal malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://icloudcleaners.com/uploads/account/autoresponderfiles/95426024965.pdf In PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/3a6f4530f21fcad35c31ba7248eace11/61445729646.pdfIn PDF document text
    • http://royal-pizza.eu/files/file/zamuvoviturazidokupumovi.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133604908c53---pokibixenitemut.pdfIn PDF document text
    • https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/25699736848.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161421d717c158---lusazejirowimikopib.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161469286d0064---44236074949.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/turolafikawa.pdfIn PDF document text
    • https://cfi-registration.amyhalter.com/buzzboxgift/img/userfiles/files/81212762039.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/sevonem.pdfIn PDF document text
    • http://cmtsport.com/pliki/tozuteraba.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/tenuwiwetulekujab.pdfIn PDF document text
    • http://gibisch.com/files/files/butolugusevapik.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/lupesiparogijanaluwafut.pdfIn PDF document text
    • https://krantiservice.com/ckfinder/userfiles/files/xaposamu.pdfIn PDF document text
    • http://kientrucphatloc.com/upload/files/garuzivegugogumujisopij.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/276c1a377481691911d1695ae28d6431/53103189283.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/gatakujologenamezudarala.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614030969cc41---wezoxij.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/39625363185.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/24a7a839b40bf7134551f974a7943bd8/wugasamuduveximogat.pdfIn PDF document text
    • http://sin-hua.org/userfiles/73585716344.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/kibalirawonuruzubitosu.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/mofatamogopebofi.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/gujelajujilotedogobanu.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/9354281495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+crack+wifi+password+in+android+phonesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9DD 10840 bytes
SHA-256: 190b4cd6281b2a6aef9ba31de0769e55ee66b9d8c0ed9479c6801a19f709c395
font_02_sfnt_off000112e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E0 17572 bytes
SHA-256: f5cd245ae655041c4fd08c8ee5bf295fb91883cd888cfcf05d93c97b423f024a

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